---------------------

Changed:

* Rewrite Sphinx extension. The extension is now in the ``everett.sphinxext``
  module and the directive is now ``.. autocomponent::``. It generates better
  documentation and it now indexes Everett components and options.

  This is backwards-incompatible. You will need to update your Sphinx
  configuration and documentation.

* Changed the ``HISTORY.rst`` structure.

* Changed the repr for ``everett.NO_VALUE`` to ``"NO_VALUE"``.

* ``InvalidValueError`` and ``ConfigurationMissingError`` now have
  ``namespace``, ``key``, and ``parser`` attributes allowing you to build your
  own messages.

Fixed:

* Fix an example in the docs where the final key was backwards. Thank you, pjz!

Documentation fixes and updates.